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39486 (1981 ET5)
Classification: Main-belt Asteroid          SPK-ID: 2039486
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05408947582036066 3.9869e-08  
a 2.575273755185997 1.3469e-08 au
q 2.435978547674055 1.0288e-07 au
i 10.77592799692422 5.4262e-06 deg
node 213.0388569506949 2.4305e-05 deg
peri 142.3092411278946 5.7665e-05 deg
M 354.6730859514579 5.2254e-05 deg
tp 2459022.836067756229
(2020-Jun-22.33606776)
0.00021912 TDB
period 1509.501433469397
4.13
1.1842e-05
3.242e-08
d
yr
n .2384893396043923 1.8709e-09 deg/d
Q 2.714568962697939 1.4197e-08 au
  Orbit Determination Parameters
   # obs. used (total)      818  
   data-arc span      14082 days (38.55 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-08-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58629  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 02:00:03  

Additional Information
 Earth MOID = 1.44246 au 
 Jupiter MOID = 2.50618 au 
 T_jup = 3.401 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.8   n/a MPO395375  
diameter diameter 6.995 km 0.190 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.048   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39486 (1981 ET5)          Discovered 1981-Mar-07 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 ET5 = 1998 HU100 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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